Math · Fourth Grade, Primary · Unit 4: Patterns and Algebra · First Semester
A 10-question quiz; after every question you'll see the right answer with an explanation.
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In this lesson we tell the difference between an expression such as 18 − (6 + 2) and a number sentence such as 7 + 5 = 12, and we find the value of expressions and unknown numbers. This is the beginning of algebraic thinking.
💡 Tip: Always work inside the parentheses first: 18 − (6 + 2) = 18 − 8 = 10. If you ignored the parentheses and worked from the left, you would get 14, which is wrong.
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An expression is numbers and operations without an equals sign, like 25 − 9, while a number sentence has an equals, greater-than, or less-than sign, like 25 − 9 = 16.
I think: what number do I subtract from 30 to leave 12? I subtract 30 − 12 = 18, so the unknown number is 18.
Start the lesson quiz on Study with Ghada: 10 questions from the Math Fourth Grade, Primary question bank. After each answer you'll see the right answer with an explanation, and any questions you miss move to “Review my mistakes” until you master them.
Yes, completely free. They're built on the Math - Grade 4 - Semester 1 lessons in the same order as the book, and every question is reviewed and approved by a teacher before students see it.
